Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 47,723	$ 43,299	$ 46,499	$ 43,300
Acquisition				699
Deferral of new extended warranty revenue	7,048	10,442	22,773	22,818
Recognition of extended warranty deferred revenue	(6,420)	(6,252)	(20,921)	(19,328)
Balance at end of period	$ 48,351	$ 47,489	$ 48,351	$ 47,489